​Starcraft II Heart of the Swarm is a Real-time Strategy and the second installment of Satrcraft II trilogy created by Blizzard Entertainment. The expansion introduces additional units, and also a few changes to multiplayer mode. Heart of the Swarm also continues single player campaign, this time focusing on the Zerg species.

The story of Heart of the Swarm begins two years after the final scenes of Wings of Liberty. It will focus on the Zerg race and feature Sarah Kerrigan as the protagonist. The campaign begins with Kerrigan's quest to assume leadership of the swarm and exact her revenge on Arcturus Mengsk, Emperor of the Terran Dominion. Sarah has to take control of the scattered Zerg, now led by rivaling queens, and lead them to victory. All that while General Warfield of the Dominion is attempting to eradicate the Zerg on Char.

The game features around 20 single player missions and introduces new units for multiplayer mode. Campaign varies from the one in the Wings of Liberty. Kerrigan plays the role of a hero unit (just like in Warcraft III). She is able to respawn after death and use different sets of skills (e.g. Spec Ops and Corruption)..

Additionally, Starcraft 2: Heart of the Swarm comes with an arcade which is full of loads of other Starcraft related games, so effectively players get several games in one. The mini games can be searched for by genre and you can provide a rating for the stuff you've played, in order to allow the better efforts to rise to the top!
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Key Features:

Continues the epic story of StarCraft II from where Wings of Liberty left off.

Approximately 20 new campaign missions.

New campaign gameplay mechanics, allowing players to evolve new abilities and units for their zerg army.

Go into battle with Kerrigan as she tries to restore her strength and regain control of the Swarm.

New multiplayer units and maps, expanding strategic choice and gameplay depth for each race.

Expanded features and functionality for Battle.net to improve custom-game search, and new tools for map authors to create even more epic custom games.

New pre-rendered and in-game cinematics bring the story of Heart of the Swarm to life.